Weight added in any form helps reduce felt recoil. I use solid lead weight melted into straight copper tubing of various sizes for my recoil reduction. Solid weights act quicker than springs bouncing or liquids splashing forward to counteract felt recoil. With springs or liquid weights, the gun MUST move back wards in order to cause the rearward stop with such weights???? Not so with solid weight! It's pennies for lead/copper tubed versus lotsa dollars for factory made whiz gidgets and pennies win in this case!
I've bought and used most all of them at one time or another too!
I have one in my model 12 that has been singing to me for around fifty years.
Jesse Edwards installed in at the Illinois shoot at Mathers Gun club many years ago.
During the last Grand held at Vandalia I ran across Jesses grandson who was set up under a tree with the Edwards reducer line.
We got to talking about his grand father and what a character he was .
Jesse lived in the Alton, Edwardsville Illinos area and we all knew him from the shoots.
Long story short, the grandson invited me to sit down with him and drink some of his beer while he took the Reducer our of the model 12 and went through it and freed it up, as it wouldn't even bounce when he tested it.
I believe he said that he was located in New Jersy and mainly markets his device to the sporting clay shooter and big bore rifle shooters that shot the heavier shells.
He told me that back in the day when we all shot model 12s and 870s and three dram shells, it was an effective way to to manage felt recoil.
With the advent of the lighter loads that most of us shoot, it really wasn't that effective.
He wouldn't charge me anything for for servicing the reducer and was just happy to hear and share stories about his granfather.
It is one of my most cherished memories of my last Grand at Vandalia.
Pretty good service after the sale!